[FIX] crm: fixed dependancies. The email_template module is auto installed by mail...

[FIX] crm: fixed dependancies. The email_template module is auto installed by mail, but it's not a real dependancy and email_template could be uninstalled, what would lead to a crash in crm because it is using this feature (revno 8287.1.11, merged in v7 in revision 8382). To solve this issue, i just add the dependancy... even if it's a stable version, because we hope that the exception case explainde before cannot be found yet.

bzr revid: qdp-launchpad@openerp.com-20130116145451-vmk17f4mmor6ulpy